Pterosaurs are the earliest vertebrates known to have evolved powered flight.
Their wings were formed by a membrane of skin, muscle, and other tissues stretching from the ankles to a dramatically lengthened fourth finger.
Early species had long, fully toothed jaws and long tails, while later forms had a highly reduced tail, and some lacked teeth.
Many sported furry coats made up of hair-like filaments known as pycnofibers, which covered their bodies and parts of their wings.
Pterosaurs spanned a wide range of adult sizes, from the very small anurognathids to the largest known flying creatures of all time.
El Begaa, Taouz, Morocco
37mm Azhdarchid pterosaur beak